Re: [jruby-user] jruby inside jython

You are right. I got the same error when I tried your ruby script from
Java program in which enough paths are set.
I figured out the error was caused by JRuby script engine's incomplete
initialization. After adding these three lines to the init() method of
JRubyScriptEngine class, I could run your script and got outputs as
expected.

        IAccessor d = new ValueAccessor(runtime.newString("<script>"));
        runtime.getGlobalVariables().define("$PROGRAM_NAME", d);
        runtime.getGlobalVariables().define("$0", d);

This seems to be one of the missing initialization processes of
JRuby's script engine. For example, referring $stdout also raises a
similar exception. But, I've not yet figured out where other bugs come
from.

-Yoko

On Nov 15, 2007 12:00 PM, adam goucher <adam_goucher@xxxxxxxxxxx> wrote:
>
> Hmm. I don't think that was the problem (or if it was, I havent got to the
> part where it would manifest. I have the lib path specified in the classpath
> and and I set it as a java runtime option to be doubly sure.
>
>  rem classpath
> set CLASSPATH=C:\temp\jpythonruby\jruby-1.0.2\lib\jruby.jar
> set
> CLASSPATH=%CLASSPATH%;C:\temp\jpythonruby\jsr223-engines\jruby-engine.jar
> set CLASSPATH=%CLASSPATH%;C:\temp\jpythonruby\jruby-1.0.2\lib\ruby\1.8
>
>  "C:\Program Files\Java\jdk1.6.0_03\bin\java.exe"
> -Dpython.home="C:\temp\jpythonruby\jython2.2b2" -classpath
> "C:\temp\jpythonruby\jython2.2b2\jython.jar;%CLASSPATH%"
> -Djruby.lib=C:\temp\jpythonruby\jruby-1.0.2\lib\ruby\1.8
> -Djruby.home=C:\temp\jpythonruby\jruby-1.0.2 org.python.util.jython %ARGS
>
> The exception also happens in one of the files brought into the mix via the
> require which would imply that finding parts of the install is not a problem
>
>  -adam
>
>
>
>
> > I think the problem is your jython code doesn't set the path to Ruby
> > scripts resides in test/unit directory. As for Java, setting a system
> > property, "com.sun.script.jruby.loadpath," before getting a instance
> > of JRuby's engine might resolve this kind of errors.
> >
> > String loadPath =
> > "C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8";
> > System.setProperty("com.sun.script.jruby.loadpath", loadPath);
> > ScriptEngineManager manager = new ScriptEngineManager();
> > ScriptEngine engine = manager.getEngineByName("jruby");
> >
> > But, sorry, I don't know how to set a system property by jython.
> >
> > -Yoko
> >
> > On Nov 15, 2007 10:34 AM, adam goucher <adam_goucher@xxxxxxxxxxx> wrote:
> > >
> > > (I tried to search the archives, but it wasn't working...)
> > >
> > > I'm trying to use JRuby in Jython via the JSR-233 engine. The ruby
> script
> > > is a Test::Unit::TestCase originating one and runs from the command line
> > > using the regular ruby interpreter. When I try to run it from it from
> inside
> > > my script however, things get ugly. I'm rather confused as to why it is
> > > blowing up in the way it is, but realize that it might be something
> trivial
> > > to make it work and having hit the 'spent enough time not figuring it
> out'
> > > its off to the mailing list.
> > >
> > > So can anyone shed light into the origin of the backtrace or have solved
> > > this problem a different way?
> > >
> > > Note: r.eval('puts "Hello!"') works fine, it is just when I pass in this
> > > script that it does not work.
> > >
> > > Thanks.
> > >
> > > -adam
> > > http://adam.goucher.ca
> > >
> > > <ruby>
> > > require 'test/unit'
> > > class ExampleTest < Test::Unit::TestCase
> > > def test_something
> > > p "ruby!"
> > > end
> > > def test_another
> > > p "again!"
> > > end
> > > end
> > > </ruby>
> > >
> > > <jython>
> > > import javax.script.ScriptContext
> > > import javax.script.ScriptEngine
> > > import javax.script.ScriptEngineManager
> > > import javax.script.ScriptException
> > >
> > > m = javax.script.ScriptEngineManager()
> > > r = m.getEngineByName("jruby")
> > > rs = open(f, "r")
> > > y = r.eval(rs.read())
> > > rs.close()
> > > </jython>
> > >
> > > <ugliness>
> > > Traceback (innermost last):
> > > File "jpythonruby.py", line 48, in ?
> > > C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8/test/unit/autorunner.rb:59:
> > > private
> > > method `sub' called for nil:NilClass (NoMethodError)
> > > from C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8/test/unit.rb:2:in
> > > `call'
> > > from
> > >
> C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8/test/unit/autorunner.rb:198:in
> > > `run'
> > > from
> > >
> C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8/test/unit/autorunner.rb:13:in
> > > `run'
> > > from C:/temp/jpythonruby/jruby-1.0.2/lib/ruby/1.8/test/unit.rb:278
> > > from <unknown>:1
> > > ...internal jruby stack elided...
> > > from org.jruby.runtime.Block.yield(Block.java:260)
> > > from org.jruby.runtime.Block.call(Block.java:214)
> > > from org.jruby.RubyProc.call(RubyProc.java:169)
> > > from org.jruby.RubyProc.call(RubyProc.java:148)
> > > from org.jruby.Ruby.tearDown(Ruby.java:1447)
> > > from
> > > org.jruby.javasupport.JavaEmbedUtils.terminate(JavaEmbedUtils.java:66)
> > > from
> > >
> com.sun.script.jruby.JRubyScriptEngine.evalNode(JRubyScriptEngine.java:396)
> > > from
> > > com.sun.script.jruby.JRubyScriptEngine.eval(JRubyScriptEngine.java:139)
> > > from
> > > javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:247)
> > > from sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > > from
> > >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > > from
> > >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > > from java.lang.reflect.Method.invoke(Method.java:597)
> > > from org.python.core.PyReflectedFunction.__call__(Unknown Source)
> > > from org.python.core.PyMethod.__call__(Unknown Source)
> > > from org.python.core.PyObject.__call__(Unknown Source)
> > > from org.python.core.PyInstance.invoke(Unknown Source)
> > > from org.python.pycode._pyx0.f$0(jpythonruby.py:48)
> > > from org.python.pycode._pyx0.call_function(jpythonruby.py)
> > > from org.python.core.PyTableCode.call(Unknown Source)
> > > from org.python.core.PyCode.call(Unknown Source)
> > > from org.python.core.Py.runCode(Unknown Source)
> > > from org.python.core.__builtin__.execfile_flags(Unknown Source)
> > > from org.python.util.PythonInterpreter.execfile(Unknown Source)
> > > from org.python.util.jython.main(Unknown Source)
> > > org.jruby.exceptions.RaiseException: org.jruby.exceptions.RaiseException
> > > </ugliness>
> > >
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